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LettersV Patent No. 79,225, dated y23, 186,8.

IMPROVEMENT IN STEAM-GENERATORS.

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TO ALL WHOM IT MAY CONOERN:

Be it known that I, II. Hams, of the city, county', and State ot"New York,`have invented a nenP and improyed Steam-Boiler; and I do hereby declare the following tofbc a full, clear, and exactdescription thereof, which will enable those skilledin the art to which my invention 4appertains to fully understand, use, and, make the same, reference being had tothe accompanying drawings, forming part of this specification., in which drawing- Y f `Figure I represents a vertical central section of this invention.'

Figure 2 is a horizontal section thereof, the line -x x, in ig.`1, indicating the plane of section.

Similar lettersof reference indicate corresponding parts.

This invention relates to a steam-boiler, which is formed of-two distinct parts,` one inside ofthe other. The steam-dome of the inner or central part extends upith'rongh the centre of the outer or annular waterspace, and the water and steam-,spaces of both parts respectively'communicate with each other through suitable pipes.

} A The fire-box of the central part is provided with a series ot` water-legsisecured inthe crown-sheet thereof.l

The heated gases and products otcombustion rising from theiire on thegrate play round said water-legs, and escape, through apertr'es at'or near the top of the {ire-box, into a combustionfchamber formed'on the outside of the central part, and between the same and the annular water-space which surrounds saidv central part. In this combustion-chamber the draught is downward, so that z rthe recomes in contact with the .outer surface of the water-space which surrounds the fire-box, as ldell as' Vwith' the inner surface thereof, thus 4increasing materially the elective heating-surface and insuring a complete ycombustion of the gases. `This heating-surface is still further increased by a series of pipes secured tothe outside nf -the central part .and situated in the combustion-chamber ffornied between bo-th'parts. These water-pipes connect at their bottom ends with the lower part of' the-water-space of-` the central part, and fromtheir top ends extend siphons into the Water-legs, which are secured to the crown-sheet of the'ire-box in such a manner that the hot water'which rises in said water-legs is replaced .by cooler water' from'the outside tubes, thereby insuring a perfect circulation ot' the water. n

The combustion-chamber, as formed between the outside wall, or a part thereof, of the central part, andthe inside wall of the annular'water-space, and a diaphragm at or near the top of said annular water-space contracts,- the products Aof combustion gradually as` they descend in it, and the mostso in that section Where they leave the comhnstion-'chambe r in order` to transmit as much heat as possible to those parts of t'hetwoparts which form the combustion-chamber.- I

From this combustion-chamber the gases pass through this annular Water-space by means of fire-tubes provided n the same. The annular water-space is arranged so as to be readily detached from-the central part for the purpose of repairing. l

IVI-represents the central part, of which A is the fire-box, In the bottom part of this-fire -box is situated the grate B, and from its top or crown-sheet descends a series of Water-legs, 0. Said firefbox is surrounded by the waterspace D, and above it rises' the dome E, which communicates with said-natcr-space and with the Water-legs C, as showninig. 1 of" the drawing.

,The heated gases and products ofv combustion, which (rise from the re on the grate, are/brought in direct contact with the inner .wall of the water-space .D and with'the outer' surfaces of the water-legs C, and-'they escapethrough apertures, a, at or near the top'ot` the hre-box into the combustion-chamber F, which is formed 'between the central part, and` the' vannular water-space@ surroundingthe same.

In this cornbustion-chamber the draught is do\vn\ vard,.sothat the fire comes in direct contact with the outer wall of 'thewater-space D, whereby the eiective heating-surface of the boiler vis materially increased. This eect .is still further increased by making the shape ofthe central and annular parts such that the combustion-chamber'contracts toward the bottom end and becomes smallest where the gases escape therefrom.

Y On the outside of the central part, and in the combustion-chamber F, is secured aseries of water-pipes, H, whicl1 communicatie at"their bottom ends with the water-space D,'and` at their'top ends with the lower part" of the dome- E. 'AAS the fire descends in the combustion-chamber, it plays round these'tvater-pipes, and the effective heating-surfacen is still further increased. y v y The water-pipes H v'are connected with th'e waterlegs C by means of siphons,;b, the long 'legs oi" which extend'nearly down to the bottom of saidwater-legs', so that the hot water which rises in saidiratcr-leg's by the ,action of the heat will bereplaced by cooler water descending through the siphons, thereby` insuring a complete circulation of the water. l A I In practice, these siphons will'beimadc in two parts each, so that they can be readily taken out for the purpose of cleaning. A v i The `top of the combustion-chamber F is closedvby a diaphragm, p, which extends betiveen the central part and-the annular water-space. By these means the gases are forced downward'in the combustion-chamber, and, according to the shape of the annular water-space, they have either to pass through the same or round it before theypass oli-` through the chimney. l

Said annular water-space Gr may be arranged, as represented in the drawing, with fire-tubes, c, which extend through it from end to end, and form the channel for lthe gases, or 'this annular watersspace may be made without those {ire-tubes, c, and maythen be surrounded by a 'casingf'with a space left between it and the annular part, which space willthen be' the channelfor thegases passing up toward. the ehim'ney. In either case the steam-room or top ofthe annular rater-space G is connected to the dome E ot' the central part bycne or more pipes, said steam-dome being made to extend upthrough the-centre of the annular water-space.

The water is admitted through the feed-pipe d to the annular water-spaceI G, and passes over to the \vnter' space `D of the central part by means of one or more pipes', c, as shown in the drawing.

These pipes e reach up part way in the annular water-space,so that the hottest and cleancst water only can pass over to thicentral part, and the sediment is kept back in the former, and by this arrangement a perfeet and positive circulation of the water isobtained, not only in the annular water-space G, but also'in thecentral part M.

The annular water-space is arranged, in its connection with the centrall part, in a manner that it can be,

detached from it very easy. The annular water-space 4G is covered up by a bonnet, I, from the top' of which rises the smoke-stackJ.

By these means a stearnbciler is obtained which contains a very extensive heatingsurface,.and which also insures a perfect combustion ofthe fuel. e l

Having thus described my invention, what I claim as new, and desire to's'ecurc by Letters Patent, is-

1. A steam-generator, composed of an internal main'or central part, M, and of an outer annuiar'wa'ter-I space, G,'said internal part being provided with a water-space, l),and iire-iues,fa, and commnnicatingwith the outer annular water-space by pipes e and q, all as shown and described;

2. The steam-dome E, rising throughthc centre of the bonnet I, which covers upthc annular water-'space G, said water-space and steam-dome being connected by pipes, q,'substantially asA and for the purpose set forth. 3. Th'e Water-pipes H, situated in the combustion-chamber F, between the central part and the annular water-space, substantially as and forlthe purpose set forth.

4.. The siphons k6, connecting the pipes H and the vwater-legs Cfsnbstantially as and' for the p urpose described.

This specification siguedby me, .this 8th day of pril,1`868.

' H. HEIN E.

Witnesses: l

W; HAUrr, l, E. F. KAs'rENnUBun. 

